xref: /freebsd/lib/msun/man/ilogb.3 (revision dc36d6f9bb1753f3808552f3afd30eda9a7b206a)

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.Dd December 16, 2007
.Dt ILOGB 3
.Os
.Sh NAME
.Nm ilogb ,
.Nm ilogbf ,
.Nm ilogbl ,
.Nm logb ,
.Nm logbf ,
.Nm logbl
.Nd extract exponent
.Sh LIBRARY
.Lb libm
.Sh SYNOPSIS
.In math.h
.Ft int
.Fn ilogb "double x"
.Ft int
.Fn ilogbf "float x"
.Ft int
.Fn ilogbl "long double x"
.Ft double
.Fn logb "double x"
.Ft float
.Fn logbf "float x"
.Ft long double
.Fn logbl "long double x"
.Sh DESCRIPTION
.Fn ilogb ,
.Fn ilogbf
and
.Fn ilogbl
return
.Fa x Ns 's exponent
in integer format.
.Fn ilogb \*(Pm\*(If
returns
.Dv INT_MAX ,
.Fn ilogb \*(Pm\*(Na
returns
.Dv FP_ILOGBNAN ,
and
.Fn ilogb 0
returns
.Dv FP_ILOGB0 .
.Pp
.Fn logb x ,
.Fn logbf x ,
and
.Fn logbl x
return
.Fa x Ns 's exponent
in floating\-point format with the same precision as
.Fa x .
.Fn logb \*(Pm\*(If
returns +\*(If, and
.Fn logb 0
returns -\*(If with a division by zero exception.
.Sh SEE ALSO
.Xr frexp 3 ,
.Xr ieee 3 ,
.Xr math 3 ,
.Xr scalbn 3
.Sh STANDARDS
The
.Fn ilogb ,
.Fn ilogbf ,
.Fn ilogbl ,
.Fn logb ,
.Fn logbf ,
and
.Fn logbl
routines conform to
.St -isoC-99 .
The latter three
implement the logb function recommended by
.St -ieee754 .
.Sh HISTORY
.Bl -tag -width "Function " -compact
.It Em Function
.Em "First Appeared In"
.It Fn logb
.Bx 4.3
.It Fn ilogb
.Fx 1.1.5
.It Fn ilogbf
.Fx 2.0
.It Fn logbf
.Fx 2.0
.It Fn ilogbl
.Fx 5.4
.It Fn logbl
.Fx 8.0
.El